Partner 23 - UCam (United Kingdom)
Centre for Atmospheric Science, University of Cambridge (U

Expertise and experience of the organization
The Centre for Atmospheric Science (CAS) at the University of Cambridge pursues fundamental research into the chemical and physical processes controlling the structure and composition of the Earth's atmosphere. The research programme comprises laboratory studies, field measurements, modelling and theoretical analysis, and a major strength of CAS is in the strong interactions between these various disciplines. Researchers at the Centre for Atmospheric Science have been actively developing and applying a range of chemistry-transport models and chemistry-climate models to numerical studies of the troposphere and stratosphere for more than 20 years, and have particular expertise in the areas of tropospheric oxidation processes, long-range transport, stratosphere-troposphere coupling, chemistry-climate feedbacks, stratospheric ozone hole development and recovery, and evaluation of models against atmospheric measurements. CAS has been a major contributor to national, European and international research projects, recently including ACTO, EXPORT, ITOP, MOZAIC, POET, RETRO, THALOZ, TRADEOFF, ACCENT, HTAP, AMMA, ACTIVE and SCOUT-O3.
Role and contribution
The principal contribution will be application of a high resolution (40-60 km) global chemistry-climate model (a nudged version of the UK Met Office Unified Model together with the recently-developed UKCA chemistry-aerosol model) to explore the regional and global effects of megacity emissions on atmospheric composition and climate. Application of this model to case studies of megacity plumes and long-range transport will provide an improved understanding of the global impacts of megacity emissions on ozone and other oxidants, and comparison with regional model studies will allow a better assessment of uncertainty in the representation of export processes and fast chemistry in global models, providing an important contribution to WP5. The relatively high resolution of this global model will provide additional insight by effectively bridging the gap between regional and global model studies, allowing the impacts of model resolution to be quantified, and providing an improved understanding of the effects of megacities over continental and global scales.

Principal personnel involved
John Pyle, Prof., FRS, Director of CAS, is the head of Physical Chemistry at the University of Cambridge. He has more than 30 years experience in the development and application of models of atmospheric chemistry and has worked extensively on stratospheric ozone and on atmospheric chemistry-climate interactions. He has been coordinator and PI on a large number of national and EU projects, most recently including QUAAC, UKCA and SCOUT-O3.
Oliver Wild, Dr., Res. Assoc., works at CAS; has extensive experience over the past 15 years in the development and application of tropospheric chemistry models to study the intercontinental transport of oxidants, the evolution of tropospheric oxidation, the links between air quality and climate change, and quantification of model uncertainty through detailed comparisons between model results and atmospheric measurements. He has participated in a number of international projects, including NARE, TRACE-P, ACCENT and HTAP and has contributed to assessment reports by WMO and IPCC.
Maria Russo, Dr., Res. Assoc., works at CAS; responsible for developing the high-resolution and mesoscale versions of the UKCA model, and is involved in providing modelling support to a number of measurement campaigns related to EU projects (ACTIVE, SCOUT-O3, AMMA).

Selected relevant publications
Wild, O., M.J. Prather (2006): Global tropospheric ozone modelling: Quantifying errors due to grid resolution, J. Geophys. Res., 111, D11305, doi:10.1029/2005JD006605.
Zeng, G., J.A. Pyle (2005), Influence of El Nino Southern Oscillation on stratosphere/troposphere exchange and the global tropospheric ozone budget, Geophys. Res. Lett., 32, doi:10.1029/2004GL021353.
Wild. O., P. Pochanart, H. Akimoto (2004): Trans-Eurasian transport of ozone and its precursors, J. Geophys. Res., 109, D11302, doi:10.1029/2003JD004501.
Wild, O., et al. (2004): CTM ozone simulations for spring 2001 over the Western Pacific: Regional ozone production and its global impacts, J. Geophys. Res., 109, D15S02, doi:10.1029/2003JD004041.

FP7 EC MEGAPOLI, 2008-2011